@article {Kavkler2005,
 author="Iztok Kavkler",
 title={Similarity invariant semigroups generated by non-Fredholm operators},
 journal="Bull. Austral. Math. Soc.",
 fjournal={Bulletin of the Australian Mathematical Society},
 volume="72",
 year="2005",
 number="3",
 pages="407--421",
 issn="0004-9727",
 coden="ALNBAB",
 language="English",
 date="5th July, 2005",
 classmath="47D03, 47A05",
 publisher={AMPAI, Australian Mathematical Society},
 url="http://www.austms.org.au/Publ/Bulletin/V72P3/723-5201-Kavkler/index.shtml",
 acknowledgement={},
 abstract={ Let $A \in B(\hs )$ be a bounded non-compact operator that is not semi-Fredholm. The similarity invariant semigroup generated by $A$ is shown to consist of all operators that are not semi-Fredholm and satisfy obvious inequalities for the nullity and co-nullity. }
}